US9238428B2 - Back frame for vehicle seat - Google Patents

Back frame for vehicle seat Download PDF

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Publication number
US9238428B2
US9238428B2 US14/309,097 US201414309097A US9238428B2 US 9238428 B2 US9238428 B2 US 9238428B2 US 201414309097 A US201414309097 A US 201414309097A US 9238428 B2 US9238428 B2 US 9238428B2
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US
United States
Prior art keywords
bracket
frame
press
frame body
back frame
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Expired - Fee Related
Application number
US14/309,097
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English (en)
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US20140375106A1 (en
Inventor
Nobuhiro Yamada
Fumitoshi Akaike
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Toyota Boshoku Corp
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Toyota Boshoku Corp
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Publication date
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Assigned to TOYOTA BOSHOKU KABUSHIKI KAISHA reassignment TOYOTA BOSHOKU KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AKAIKE, FUMITOSHI, YAMADA, NOBUHIRO
Publication of US20140375106A1 publication Critical patent/US20140375106A1/en
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Publication of US9238428B2 publication Critical patent/US9238428B2/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/68—Seat frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/22—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/22—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable
    • B60N2/225—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable by cycloidal or planetary mechanisms
    • B60N2/2252—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable by cycloidal or planetary mechanisms in which the central axis of the gearing lies inside the periphery of an orbital gear, e.g. one gear without sun gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/68—Seat frames
    • B60N2/682—Joining means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/22—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable
    • B60N2/235—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable by gear-pawl type mechanisms
    • B60N2/2356—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable by gear-pawl type mechanisms with internal pawls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/427—Seats or parts thereof displaced during a crash
    • B60N2/42727—Seats or parts thereof displaced during a crash involving substantially rigid displacement
    • B60N2/42745—Seats or parts thereof displaced during a crash involving substantially rigid displacement of the back-rest

Definitions

  • the present invention relates to a back frame for a seat which is mounted in a vehicle such as an automobile, airplane, ship, train, or the like.
  • a back frame which is a framework of a seat back of a vehicle seat, and which is formed by bending an extruded member (refer to DE29816819).
  • a recliner mounting bracket (hereinafter, referred to as a bracket) is fixed by welding to a frame body which is formed by extrusion molding.
  • the welding method for fixing the bracket to the frame body is preferably avoided when taking the productivity into consideration.
  • the frame body and the bracket are made of different materials, that is, for example, when the frame body is made of aluminum and the bracket is made of iron, the productivity of the welding fixing method becomes worse. Accordingly, it is considered to fix the bracket to the frame body by press-fitting (not known).
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to ensure a strength required by a back frame while taking the productive of the back frame into consideration by enhancing the connecting strength of a bracket to a frame body in a direction in which the bracket is press-fitted.
  • a back frame of a vehicle seat comprising a frame body formed by extrusion molding and including a press-fitting portion into which a part attachment bracket is press-fitted for attaching a part to the frame body, wherein the press-fitting portion of the frame body and an abutment surface of the bracket are formed with an engagement portion where one of the frame body and the bracket is brought into engagement with the other in a direction in which the part attachment bracket is press-fitted into the press-fitting portion.
  • the engagement portion where one of the frame body and the bracket is brought into engagement with the other in the press-fitting direction and therefore, the connecting strength of the bracket to the frame body in the press-fitting direction can be enhanced, thereby making it possible to ensure the strength required by the back frame. Further, since the welding method is not used, the productivity can be improved.
  • the press-fitting portion of the frame body and the abutment surface of the bracket may be formed with a plurality of engagement portions along the press-fitting direction.
  • the plurality of engagement portions are formed along the press-fitting direction, a load applied to one of the engagement portions can be dispersed.
  • the engagement portions can withstand a larger load altogether.
  • the engagement portion may include: a through hole formed in the abutment surface of the bracket to penetrate through the abutment surface in a direction which is perpendicular to the press-fitting direction, and a projection formed in the press-fitting portion of the frame body to fit in the through hole.
  • the projection on the frame body fits in the through hole in the bracket, whereby the bracket and the frame body are brought into engagement with each other.
  • the projection may be fitted into the through hole by pressing a portion of the frame body which corresponds to the through hole after the through hole is formed in the bracket, and the bracket is press-fitted into the press-fitting portion of the frame body.
  • the engagement portion can be formed easily.
  • the through hole is formed to penetrate in the direction which is perpendicular to the press-fitting direction, the projection which is fitted into the through hole is formed to project in the same direction, thereby making it possible to enhance the fixing strength against the load acting in the direction in which the bracket is removed from the frame body.
  • FIG. 1 is an outer perspective view of a vehicle seat including a back frame according to an illustrative embodiment of the present invention
  • FIG. 2 is a perspective view of the back frame according to the illustrative embodiment
  • FIG. 3 is a front view of the back frame according to the illustrative embodiment
  • FIG. 4 is a side view of the back frame according to the illustrative embodiment
  • FIG. 5 is an enlarged sectional view taken along the line V-V in FIG. 3 ;
  • FIG. 6 is an enlarged sectional view taken along the line VI-VI in FIG. 4 ;
  • FIG. 7 is a perspective view of a frame body according to the illustrative embodiment and shows the frame body before bent;
  • FIG. 8 is a perspective view of the frame body according to the illustrative embodiment and shows how to bend the frame body
  • FIG. 9 is an exploded perspective view of the back frame according to the illustrative embodiment.
  • FIG. 10 is an enlarged sectional view taken along the line X-X in FIG. 3 ;
  • FIG. 11 is an enlarged side view of the periphery of a recliner attachment bracket in the back frame according to the illustrative embodiment
  • FIG. 12 is a front view of the recliner attachment bracket according to the illustrative embodiment.
  • FIG. 13 is an enlarged sectional view taken along the line XIII-XIII in FIG. 11 ;
  • FIG. 14 is an enlarged sectional view taken along the line XIV-XIV in FIG. 11 .
  • the back frame 10 of this illustrative embodiment constitutes a framework of a seat back 2 of a vehicle seat 1 which is configured as a front passenger seat of an automobile (vehicle).
  • the vehicle seat 1 has the seat back 2 which configures a backrest for a passenger seated in the seat, a seat cushion 3 which configures a sitting portion of the seat, and a headrest 4 which configures a headrest portion of the seat.
  • the seatback 2 is connected to both left and right side rear end portions of the seat cushion 3 at both left and right side lower end portions thereof with circular disk-shaped recliners (not shown) interposed respectively therebetween.
  • the each recliner functions as a rotational shaft device which can stop rotating when required. This enables the seatback 2 to be connected to the seat cushion 3 such that the angle of the backrest can be adjusted.
  • the seat cushion 3 is provided on a floor of the vehicle with a pair of left and right slider devices (not shown) interposed therebetween. This enables the seat cushion 3 to be adjusted in its front-rear position in relation to the floor of the vehicle.
  • the basic structures of the recliners and the slider devices (not shown) are similar to those described in documents such as JP-A-2011-116303, JP-A-2010-221935 and the like, and therefore, a detailed description thereof will be omitted here.
  • the headrest 4 is mounted at an upper portion of the seatback 2 .
  • two rod-shaped stays which project from a lower portion of the headrest 4 are inserted respectively into cylindrical support members (not shown) from above which are installed individually in two holders 13 which are fixed to an upper frame 12 of the back frame 10 , whereby the headrest 4 is fixedly mounted at the upper portion of the seatback 2 .
  • the configuration in which the headrest 4 is mounted on the seatback 2 by inserting the stays (not shown) of the headrest 4 respectively into the holders 13 which are fixed to the back frame 10 is similar to that described in documents such as JP-A-2008-239075 and the like, and therefore, the description thereof will be omitted here.
  • the back frame 10 includes frame bodies 11 which configure frameworks of left and right side portions of the seatback 2 and which are each bifurcated to define an opening between bifurcated branches, the upper frame 12 which configure a framework of an upper side portion of the seatback 2 , the two angularly cylindrical holders 13 which are joined to the upper frame 12 in two left and right positions thereon, and brackets 14 which are made of a high tensile steel sheet and which are joined to lower end portions of the frame bodies 11 , respectively.
  • the frame bodies 11 and the upper frame 12 may be collectively referred to as a frame body.
  • the back frame 10 is formed as described below. Firstly, as shown in FIG. 7 , a single extruded member of an aluminum alloy is pressed to be bent into an inverted U shape, and in this bent extruded member, the frame bodies 11 and the upper frame 12 are provided in continuously integrally. Before or after the extruded member is bent, a slit 11 C is made in each of the frame bodies 11 such that each of the frame bodies 11 can be bifurcated afterwards so as to define an opening between two branches (a slit forming step). Additionally, cutouts 12 A are formed in the upper frame 12 in positions (refer to FIG.
  • each slit 11 C is made straight so as to extend from a position lying near an upper end side through a lower end side of each frame body 11 . It is noted that the slits 11 C and cutouts 12 A may be formed in the upper frame 12 after a bent process and an open process performed on the back frame 10 as will be described below.
  • the back frame 10 is pressed such that the frame bodies 11 are bent towards the rear of the seat at middle portions thereof into an arch shape (a bending step).
  • the back frame 10 is pressed such that respective branch frames 11 A, 11 B of the frame bodies 11 which are aligned in front and rear of the slits 11 C made in the frame bodies 11 are pressed to be bent towards the rear of the seat altogether.
  • the branch frames 11 A, 11 B are pressed to be bent into the same curved shape in the front-rear direction in which they are aligned, whereby bent portions 11 A 2 , 11 B 2 are formed at the middle portions of the frame bodies 11 where the shapes of the bent branch frames 11 A, 11 B coincide with each other.
  • the front branch frames 11 B of the frame bodies 11 are bent towards the front of the seat so as to be separated apart from the rear branch frames 11 A (a separating step).
  • the front branch frames 11 B are bent towards the front of the seat from upper ends thereof which constitute starting points of separation or branching as a fulcrum so as to be separated apart from the rear branch frames 11 A.
  • This enables the frame bodies 11 to be bifurcated in the front-rear direction so as to define an opening between the separated branch frames such that a front-rear width or space of the opening gradually expands from the upper end side to the lower end side of the frame bodies 11 .
  • the brackets 14 which are made of the high tensile steel sheet are inserted into the widely opened end portions of the frame bodies 11 to be assembled into the frame bodies 11 integrally (an assembling step). Further, the holders 13 are fitted into the cutouts 12 A which are cut in the upper frame 12 in the cutout forming step and are then joined thereto integrally by welding. Accordingly, as shown in FIGS. 2 to 4 , the back frame 10 is formed in which the frame bodies 11 are bifurcated to define the opening between the front and rear branch frames into which the brackets 14 are inserted. Therefore, not only can the weight of the back frame 10 be reduced but also the structural strength thereof can be enhanced.
  • a cross-sectional shape of the back frame 10 which is made of aluminum alloy by extrusion molding includes a first cross-sectional portion 10 A which has a closed cross section and a second cross-sectional portion 10 B which has a closed cross section.
  • the first cross-sectional portion 10 A and the second cross-sectional portion 10 B is connected together while being aligned in front and rear in the front-rear direction, as shown in FIG. 5 .
  • FIG. 5 As described in FIG.
  • the back frame 10 when it is bent into the inverted U shape, the back frame 10 is bent in a direction which is perpendicular to the direction in which the first cross-sectional portion 10 A and the second cross sectional portion 10 B are aligned while the first cross-sectional portion 10 A and the second cross-sectional portion 10 B are kept in a positional relationship along the full circumference of the back frame 10 such that the second cross-sectional portion 10 B is positioned in front of the first cross-sectional portion 10 A and the first cross-sectional portion 10 A is positioned rear of the second cross-sectional portion 10 B.
  • the first cross-sectional portion 10 A has an attachment surface portion 10 A 1 formed into a flat plane which faces the front side of the seat, and reinforcement surface portions 10 A 2 which extend towards the rear of the seat from edge portions of the attachment surface portion 10 A 1 to connect to each other to thereby form a cross-sectional shape which is closed in an endless manner. Accordingly, the first cross-sectional portion 10 A is formed to have the closed cross-sectional shape.
  • the attachment surface 10 A 1 is formed into a flat plane which is inclined obliquely towards the inner circumferential side (the lower side in FIG. 5 ) of the back frame 10 in relation to a front side thereof.
  • the second cross-sectional portion 10 B has a connecting surface portion 10 B 1 which extends to the front from an edge portion of the first cross-sectional portion 10 A at the outer circumferential side (an upper side in FIG. 5 ) of the back frame 10 and a closed cross-sectional portion 10 B 2 which extends from a front edge portion of the connecting surface portion 10 B 1 towards the inner circumferential side (the lower side in FIG. 5 ) of the back frame 10 and which is then wound around to the rear to connect back to itself to define a closed cross section.
  • An opening portion 10 C which configures a gap is formed between the closed cross-sectional portion 10 B 2 of the second cross-sectional portion 10 B and the attachment surface portion 10 A 1 of the first cross-sectional portion 10 A which is positioned rear of the closed cross-sectional portion 10 B 2 .
  • This opening portion 10 C is formed to be opened towards the inner circumferential side (the lower side in FIG. 5 ) of the back frame 10 .
  • the opening portion 10 C is formed to be opened gradually widely towards the inner circumferential side (the lower side in FIG. 5 ) of the back frame 10 while the attachment surface portion 10 A 1 is inclined as described above.
  • a rail groove 10 A 3 is formed at a portion where the first cross-sectional portion 10 A is connected to the connecting surface portion 10 B 1 .
  • the rail groove 10 A 3 has a pocket-like space formed therein by depressing the cross section defined by the reinforcement surface portions 10 A 2 towards the rear of the seat.
  • This rail groove 10 A 3 has a rectangular open surrounded cross-sectional shape which is opened at a front side thereof.
  • a rail groove 10 B 3 is formed at a portion of the second cross-sectional portion 10 B where the connecting surface portion 10 B 1 is connected to the closed cross-sectional portion 10 B 2 .
  • the rail groove 10 B 3 has a pocket-like space formed therein by depressing the cross section of the closed cross-sectional portion 10 B 2 towards the front of the seat.
  • This rail groove 10 B 3 has a rectangular open surrounded cross-sectional shape which is opened at a rear side thereof symmetrically with the rail groove 10 A 3 in relation to the front-rear direction.
  • These rail grooves 10 A 3 , 10 B 3 communicate with each other in the front-rear direction through the opening portion 10 C. Namely, the rail grooves 10 A 3 , 10 B 3 are opened to the inner circumferential side (the lower side in FIG. 5 ) of the back frame 10 through the opening portion 10 C, while the rail grooves 10 A 3 , 10 B 3 are covered from the outer circumferential side (an upper side in FIG. 5 ) by the connecting surface portion 10 B 1 .
  • the slit 11 C which is formed in each of the frame bodies 11 as described in FIG. 7 are formed along the connecting surface portion 10 B 1 (refer to FIG. 5 ) which configures a connecting surface between the first cross-sectional portion 10 A and the second cross-sectional portion 10 B (refer to FIG. 6 ). Consequently, as shown in FIGS. 6 and 9 , by dividing each of the frame bodies 11 into the two branch frames from the slit 11 C, the opening portion 10 C between the first cross-sectional portion 10 A and the second cross-sectional portion 10 B is expanded, whereby the first cross-sectional portion 10 A and the second cross-sectional portion 10 B can be separated from each other in the front-rear direction. This allows the separated branch frames 11 A, 11 B to have the closed cross-sectional shapes which give high structural strengths thereto.
  • the bracket 14 which is made of the high tensile steel sheet is inserted into the open (lower) end portion of each of the frame bodies 11 which is divided into the two branch forms, from below for attachment.
  • the bracket 14 which is made of the high tensile steel sheet has a specific strength which is higher than that of the frame bodies 11 which are formed of the aluminum alloy by extrusion molding.
  • the brackets 14 are inserted respectively into the open end portions of the frame bodies 11 which are each bifurcated so as to be fitted between end portions of the branch frames 11 A, 11 B in a wedge-like manner.
  • the brackets 14 configure bridge members which join the end portions of the branch frames 11 A, 11 B together to thereby function as reinforcement plates which enhance the structural strengths at the open end portions of the frame bodies 11 .
  • the brackets 14 which are attached to the corresponding frame bodies 11 are set as joining portions with the recliners when the left and right lower end portions of the back frame 10 are connected to the left and right side rear end portions of the seat cushion 3 via the recliners (not shown) as shown in FIG. 1 .
  • the brackets 14 when attached to the lower end portions of the frame bodies 11 , the brackets 14 are oriented in a width direction of the seat as shown in FIG. 2 .
  • a plurality of fitting holes 14 A 1 used to join the bracket 14 to the recliner (not shown) and a shaft hole 14 through which an operation shaft (not shown) used to unlock the recliner are formed in sheet surfaces of the brackets 14 so as to penetrate the brackets 14 in an axial direction.
  • cylindrical projections 14 B 1 , 14 B 2 are formed at front and rear edge portions of each of the brackets 14 , and these cylindrical projections are rolled inwards towards the inner circumferential side of the back frame 10 into a cylindrical shape.
  • These cylindrical projections 14 B 1 , 14 B 2 are forcefully inserted into the corresponding rail grooves 11 A 1 , 11 B 1 ( 10 A 3 , 10 B 3 ) which are formed in the branch frames 11 A, 11 B, respectively, when the bracket 14 is inserted between the branch frames 11 A, 11 B of the corresponding frame body 11 .
  • the cylindrical projections 14 B 1 , 14 B 2 are each rolled into the cylindrical shape whose outside diameter is larger than an inner diameter of the rail grooves 11 A 1 , 11 B 1 ( 10 A 3 , 10 B 3 ).
  • the cylindrical projections 14 B 1 , 14 B 2 are press-fitted into the corresponding rail grooves 11 A 1 , 11 B 1 ( 10 A 3 , 10 B 3 )
  • the cylindrical projections 14 B 1 , 14 B 2 are strongly secured thereto.
  • the cylindrical projections 14 B 1 , 14 B 2 are strongly and firmly engaged with the corresponding rail grooves 11 A 1 , 11 B 1 ( 10 A 3 , 10 B 3 ) so as not to be removed therefrom in a perpendicular direction to the direction in which they are inserted (press-fitted) (refer to FIG. 6 ).
  • the rail grooves 11 A 1 , 11 B 1 are an example of a press-fitting portion.
  • the branch frames 11 A, 11 B of each frame body 11 are formed so as to be spaced wider than a front-rear width of the bracket 14 apart from each other in the bifurcated manner.
  • the cylindrical projections 14 B 1 , 14 B 2 of the bracket 14 are inserted into the rail grooves 11 A 1 , 11 B 1 of the branch frames 11 A, 11 B to be brought into engagement therewith.
  • the branch frames 11 A, 11 B are forced to elastically approach each other to contract the opening space defined therebetween so as to match it to the front-rear width of the bracket 14 as the bracket 14 is progressively inserted between the branch frames 11 A, 11 B due to the engagement structure between the cylindrical projections 14 B 1 , 14 B 2 and the rail grooves 11 A 1 , 11 B 1 and the rigidity of the bracket 14 which is provided by the high specific strength thereof, whereby the opening width defined between the divided branch frames 11 A, 11 B can be changed accordingly.
  • the branch frames 11 A, 11 B may be formed to be spaced narrower than the front-rear width of the bracket 14 apart from each other.
  • the cylindrical projections 14 B 1 , 14 B 2 of the bracket 14 are inserted into the rail grooves 11 A 1 , 11 B 1 of the branch frames 11 A, 11 B to be brought into engagement therewith.
  • branch frames 11 A, 11 B are forced to elastically move away from each other to spread the opening space defined therebetween so as to match it to the front-rear width of the bracket 14 as the bracket 14 is progressively inserted between the branch frames 11 A, 11 B due to the engagement constructions between the cylindrical projections 14 B 1 , 14 B 2 and the rail grooves 11 A 1 , 11 B 1 and the rigidity of the bracket 14 which is provided by the high specific strength thereof, whereby the opening width defined between the divided branch frames 11 A, 11 B can be changed accordingly.
  • each frame body 11 is formed to be bent towards the rear of the seat into the arch-like shape at their middle portions which constitute the bent portions 11 A 2 , 11 B 2 , areas of the branch frames 11 A, 11 B located below the bent portions 11 A 2 , 11 B 2 between which the bracket is inserted are formed straight so as to extend straight downwards.
  • the rail grooves 11 A 1 , 11 B 1 which are formed in the branch frames 11 A, 11 B, respectively, are also formed similarly straight to extend straight downwards.
  • the cylindrical projections 14 B 1 , 14 B 2 which are formed along the side portions of each bracket 14 are also formed into the straight cylindrical shape which extends straight in the height direction while being aligned almost parallel to each other.
  • step portions 14 C 1 , 14 C 2 are formed by the edge portions of the bracket 14 along which the cylindrical projections 14 B 1 , 14 B 2 are formed such that a central portion of the bracket 14 projects further outwards (towards the outer circumferential side of the back frame 10 : towards a right side in FIG. 6 ) than both the edge portions.
  • step portions 14 C 1 , 14 C 2 in a state where the bracket 14 is attached to the corresponding frame body 11 with the cylindrical projections 14 B 1 , 14 B 2 on the edges thereof inserted in the corresponding rail grooves 11 A 1 , 11 B 1 , the bracket 14 is positioned such that a central plate portion of the bracket 14 becomes same level as outer surfaces of the branch frames 11 A, 11 B of each frame body 11 .
  • a flange 14 D is formed at an upper edge portion of each bracket 14 by pressing, and this flange 14 D is bent towards the inner circumferential side of the back frame 10 .
  • This flange 14 D enhances the structural strength of the bracket 14 against bending and twisting and gives an inwardly round shape to the upper edge portion of the bracket 14 so as not to expose an angular shape to the outside.
  • the structural strength of the back frame 10 is enhanced effectively since the lower open end portion of the frame body 11 which is bifurcated is closed by the member having the high structural strength while fitting the bracket 14 having the high specific strength into the lower end portion of the frame body 11 which is bifurcated widely for integral attachment thereto.
  • This enables the back frame 10 to receive to support stably the load of the back rest which is given thereto from the back portion of the seated passenger by the structure in which the lower end portions of the frame bodies 11 are supported in a cantilever manner.
  • each bracket 14 the upper edge portion of the plate portion which is interposed between the branch frames 11 A, 11 B where the flange 14 D is formed so as to be inclined straight obliquely upwards to the front. This allows a rate at which the structural strength (the coefficient of the cross section) which is enhanced by the attachment of the bracket 14 changes in the height direction of the frame body 11 to be adjusted to be moderate in the area where the bracket 14 is formed into the inclined shape.
  • the upper edge portion of the bracket 14 is formed to rise gradually to the front, and this allows the bracket 14 to receive a load exerted on the back frame 10 from the front in a higher position, whereby the back frame 10 is allowed to support more firmly the load exerted thereon from the front than a case where the upper edge portion of the bracket 14 is inclined in an opposite way (so as to rise gradually to the rear).
  • the holders 13 which are attached to the upper frame 12 in two left and right positions as shown in FIG. 9 are made of an extruded member of aluminum alloy. These holders 13 are formed into a quadrangular cylindrical shape and are fitted in the corresponding cutouts 12 A which are cut in the back frame 12 in the two left and right position from the front of the seat and are then joined strongly and integrally to the upper frame 12 by welding.
  • each cutout 12 A is formed by cutting and penetrating partially the second cross-sectional portion 10 B of the upper frame 12 as shown in FIGS. 9 and 10 , and by cutting through the upper frame 12 in this manner, the attachment surface portion 10 A 1 of the first cross-sectional portion 10 A is exposed towards the front of the seat from which the holder 13 is fitted in the cutout 12 A.
  • Each cutout 12 A has the same lateral width as that of each holder 13 as shown in FIGS. 3 to 9 .
  • the holder 13 when the holder 13 is fitted in the cutout 12 A, the holder 13 is restrained from moving in a width direction of the seat by an end face configuration of the second cross-sectional surface portion 10 B which faces the cutout 12 A.
  • abutment surfaces of the holders 13 and the upper frame 12 are joined together by welding, whereby the holders 13 and the cutouts 12 A are joined strongly and integrally.
  • each cutout 12 A is formed by being cut such that an edge portion of the connecting surface portion 10 B 1 which faces the front of the seat is brought into abutment with the rear surface portion of the holder 13 in a state where the holder 13 is fitted in the cutout 12 A to be brought into surface abutment with the corresponding attachment surface portion 10 A 1 as shown in FIG. 10 .
  • the frame bodies 11 of the back frame 10 are bent towards the rear of the seat so as to be curved into the arch-like shape, and because of this, normally, the seat back 10 is used in a posture where the seat back 10 is inclined slightly towards the rear of the seat from its vertical posture.
  • the attachment surface portion 10 A 1 of the upper frame 12 on which the holder 13 is placed to be brought into surface abutment therewith faces almost straight the front of the seat (refer to FIG. 10 ). Consequently, each attachment surface portion 10 A 1 can support the corresponding holder 13 from the rear of the seat while facing straight the holder 13 , whereby the load exerted on the headrest 4 (refer to FIG. 1 ) from the front of the seat can be supported well at the upper frame 12 .
  • the frame bodies 11 of the back frame 10 are bent towards the rear of the seat so as to be curved into the arch-like shape at the middle portions thereof (to thereby form the bent portions 11 A 2 , 11 B 2 ), whereby the frame bodies 11 are formed so as to project largely to the front of the seat in positions which face both sides of a waist portion of the seated passenger.
  • This enables side support portions to be set largely so as to support the waist portion of the seated passenger from both sides thereof or the waist portion of the seated passenger to be supported strongly in a position which lies nearer to the front of the seat.
  • the frame bodies 11 of the back frame 10 are formed so as to be warped towards the rear of the seat, whereby it is possible to ensure a large leg space where a passenger seated in a rear seat can stretch his or her legs to the front.
  • FIGS. 6 and 12 a plurality of through holes 14 F 1 , 14 F 2 are provided in side portions of each bracket 14 along the direction in which the bracket 14 is press-fitted in the rail grooves 11 A 1 , 11 B 1 of the branch frames 11 A, 11 B. Then, as shown in FIGS. 11 to 14 , projections 11 A 4 , 11 B 4 are fitted in the corresponding through holes 14 F 1 , 14 F 2 of the bracket 14 .
  • the projections 11 A 4 , 11 B 4 are formed such that the branch frames 11 A, 11 B are fixed to a press table such that the bracket 14 is press-fitted in the rail grooves 11 A 1 , 11 B 1 of the branch frames 11 A, 11 B and punching is performed in positions on the branch frames 11 A, 11 B which correspond respectively to the through holes 14 F 1 , 14 F 2 in the bracket 14 , whereby the projections are formed with the portions of the bracket 14 having the high specific strength which are press-fitted in the rail grooves 11 A 1 , 11 B 1 functioning as a lower die.
  • the through holes 14 F 1 , 14 F 2 penetrate in a direction which is perpendicular to the press-fitting direction. Punching in this way forms a plurality of crimp marks 11 A 3 , 11 B 3 on the branch frames 11 A, 11 B.
  • a reference hole 14 E is opened near a central portion of the bracket 14 so as to prevent the deviation of the punching positions from the positions where the through holes 14 F 1 , 14 F 2 are formed when punching is carried out.
  • the punching positions are determined based on the positions of the through holes 14 F 1 , 14 F 2 with respect to the reference hole 14 E.
  • the reference hole 14 E may be omitted by making use of the shaft hole 14 A 2 described above as a similar reference hole. Additionally, both the reference hole 14 E and the shaft hole 14 A 2 may be used as reference holes.
  • FIG. 6 shows the branch frames 11 A, 11 B and the bracket 14 before punching is performed.
  • the through holes 14 F 1 , 14 F 2 (an example of a first engagement part) of the bracket 14 and the projections 11 A 4 , 11 B 4 (an example of a second engagement part) are an example of an engagement portion.
  • the projections 11 A 4 , 11 B 4 which are formed on the branch frames 11 A, 11 B and the through holes 14 F 1 , 14 F 2 of the bracket 14 are brought into engagement with each other (or configure the engagement portion) along the press-fitting direction of the bracket 14 into the rail grooves 11 A 1 , 11 B 1 of the branch frames 11 A, 11 B. Therefore, the joining strength of the bracket 14 to the branch frames 11 A, 11 B in the press-fitting direction can be enhanced, whereby it is possible to ensure the strength required by the back frame 10 .
  • the bracket 14 and the branch frames 11 A, 11 B are difficult to be welded together since they are formed of the different materials, employing the welding method deteriorates the productivity. However, in this illustrative embodiment, since the welding method is not employed, the productivity can be improved.
  • the load acting on one engagement portion can be dispersed, whereby even though the load resistance of each of the engagement portions is small, the engagement portions can withstand a larger load altogether.
  • the through holes 14 F 1 , 14 F 2 are formed in the bracket 14 , and punching is performed in the positions on the branch frames 11 A, 11 B which correspond to the through holes 14 F 1 , 14 F 2 in the bracket 14 after the bracket 14 is press-fitted into the rail grooves 11 A 1 , 11 B 1 of the branch frames 11 A, 11 B.
  • This allows the projections 11 A 4 , 11 B 4 to be fitted respectively in the through holes 14 F 1 , 14 F 2 , whereby the engagement portions can easily be formed.
  • the projections 11 A 4 , 11 B 4 which are fitted in the through holes 14 F 1 , 14 F 2 are formed to project in the same direction, thereby making it possible to enhance the fixing strength against a load which acts in the direction in which the bracket 14 is dislocated from the branch frames 11 A, 11 B.
  • Engagement portions can also be formed by forming notches in the bracket and providing engagement pieces on the frame body which are brought into engagement with the notches in the bracket. Additionally, when the bracket is formed of a material having a strength which is substantially the same as that of the frame bodies, it is possible to form engagement portions by performing punching at portions where the bracket and the frame bodies are superposed so as to deform the frame bodies and the bracket simultaneously.
  • the bracket is not limited to the recliner attaching bracket.
  • the present invention may also be applied to a lumbar support attaching bracket.
  • inventive concept of the present invention is applied to the vehicle seat
  • inventive concept of the present invention may also be applied to seats for airplanes, ships, trains and the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Seats For Vehicles (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
US14/309,097 2013-06-21 2014-06-19 Back frame for vehicle seat Expired - Fee Related US9238428B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013130433A JP6149537B2 (ja) 2013-06-21 2013-06-21 乗物用シートのバックフレーム
JP2013-130433 2013-06-21

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US20140375106A1 US20140375106A1 (en) 2014-12-25
US9238428B2 true US9238428B2 (en) 2016-01-19

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US14/309,097 Expired - Fee Related US9238428B2 (en) 2013-06-21 2014-06-19 Back frame for vehicle seat

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JP (1) JP6149537B2 (ja)
CN (1) CN104290632B (ja)
DE (1) DE102014211877A1 (ja)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5831512B2 (ja) * 2013-08-28 2015-12-09 トヨタ自動車株式会社 車両用シート
JP6218324B2 (ja) 2014-01-29 2017-10-25 株式会社タチエス 車両用シートのシートフレーム成形方法、シートフレームおよび車両用シート
JP6351998B2 (ja) * 2014-02-28 2018-07-04 テイ・エス テック株式会社 車両用シート
JP6398797B2 (ja) * 2015-03-05 2018-10-03 トヨタ紡織株式会社 乗物用シート
JP6578741B2 (ja) * 2015-05-25 2019-09-25 トヨタ紡織株式会社 乗物用シートのリクライナ取付用ブラケット
US9718387B2 (en) * 2015-08-03 2017-08-01 Ford Global Technologies, Llc Seat cushion module for a vehicle seating assembly
US9701227B2 (en) 2015-10-08 2017-07-11 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft Assembly group of a vehicle seat comprising a tube element and an attachment part arranged thereon
JP6614035B2 (ja) * 2016-05-25 2019-12-04 トヨタ紡織株式会社 乗物用シートのバックフレーム構造
DE102016115267B4 (de) * 2016-08-17 2023-07-06 Grammer Aktiengesellschaft Vorrichtung zum Einstellen einer Rückenlehnenneigung und Verfahren zur Montage der Vorrichtung
JP6708060B2 (ja) * 2016-08-29 2020-06-10 トヨタ紡織株式会社 乗物用シート
CN108284775B (zh) * 2018-01-30 2023-08-29 重庆博奥镁铝金属制造有限公司 一种汽车座椅靠背骨架结构
CN116279028A (zh) * 2018-09-10 2023-06-23 提爱思科技股份有限公司 乘坐物用座椅
US10843599B2 (en) * 2019-03-20 2020-11-24 GM Global Technology Operations LLC Vehicle seat assembly
US11383627B2 (en) * 2020-09-17 2022-07-12 Faurecia Automotive Seating, Llc Seat frame side member
US12024078B2 (en) * 2021-09-27 2024-07-02 Kobe Steel, Ltd. Seat back frame for automobile and method for manufacturing the same
DE202022104164U1 (de) 2022-07-22 2022-07-28 Bruns Holding Gmbh & Co. Kg Rahmen für einen Fahrzeugsitz und Fahrzeugsitz mit einem selbigen

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4787756A (en) * 1988-02-26 1988-11-29 General Motors Corporation Apparatus and method of seat adjuster slide
DE29816819U1 (de) 1998-09-22 1998-12-03 VAW Aluminium AG, 53117 Bonn Fahrzeugsitz
US20030067205A1 (en) * 2001-02-06 2003-04-10 Keiper Gmbh & Co Fitting for a vehicle seat
US20030117003A1 (en) * 2001-12-04 2003-06-26 Francois Fourrey Structure for a vehicle seat element, and a method of making such a structure
US20040227389A1 (en) * 2003-03-31 2004-11-18 Masami Yoshida Seat back frame for vehicle seat
US20080238172A1 (en) * 2007-03-29 2008-10-02 Aisin Seiki Kabushiki Kaisha Seat reclining apparatus for vehicle
US20090289488A1 (en) * 2008-05-22 2009-11-26 Toyota Boshoku Kabushiki Kaisha Connection devices in vehicle seats
JP2010221935A (ja) 2009-03-25 2010-10-07 Toyota Boshoku Corp 車両用シートのスライド装置
JP2011116303A (ja) 2009-12-07 2011-06-16 Toyota Boshoku Corp 車両用シートの連結装置
US20110227386A1 (en) * 2010-03-17 2011-09-22 Fisher & Company, Incorporated Recliner mechanism with mounting feature
US20130291676A1 (en) * 2012-05-07 2013-11-07 GM Global Technology Operations LLC Adjusting device, vehicle seat and motor vehicle and method for this
US20140232161A1 (en) * 2013-02-18 2014-08-21 Toyota Boshoku Kabushiki Kaisha Frame structures for vehicle seats

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2510289Y2 (ja) * 1992-02-27 1996-09-11 池田物産株式会社 バックフレ―ム
SE510892C2 (sv) * 1998-03-17 1999-07-05 Accra Teknik Ab Ram till en fordonsstol
JP4778733B2 (ja) * 2005-06-09 2011-09-21 富士機工株式会社 車両用シートリクライニング装置
JP5157213B2 (ja) 2007-03-28 2013-03-06 トヨタ紡織株式会社 車両用シート
FR2949398B1 (fr) * 2009-09-03 2011-08-26 Faurecia Sieges Automobile Siege de vehicule et son procede de fabrication.
JP5652149B2 (ja) * 2010-11-17 2015-01-14 トヨタ紡織株式会社 車両用シートフレームの接合構造

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4787756A (en) * 1988-02-26 1988-11-29 General Motors Corporation Apparatus and method of seat adjuster slide
DE29816819U1 (de) 1998-09-22 1998-12-03 VAW Aluminium AG, 53117 Bonn Fahrzeugsitz
US20030067205A1 (en) * 2001-02-06 2003-04-10 Keiper Gmbh & Co Fitting for a vehicle seat
US20030117003A1 (en) * 2001-12-04 2003-06-26 Francois Fourrey Structure for a vehicle seat element, and a method of making such a structure
US20040227389A1 (en) * 2003-03-31 2004-11-18 Masami Yoshida Seat back frame for vehicle seat
US20080238172A1 (en) * 2007-03-29 2008-10-02 Aisin Seiki Kabushiki Kaisha Seat reclining apparatus for vehicle
US20090289488A1 (en) * 2008-05-22 2009-11-26 Toyota Boshoku Kabushiki Kaisha Connection devices in vehicle seats
JP2010221935A (ja) 2009-03-25 2010-10-07 Toyota Boshoku Corp 車両用シートのスライド装置
JP2011116303A (ja) 2009-12-07 2011-06-16 Toyota Boshoku Corp 車両用シートの連結装置
US20110227386A1 (en) * 2010-03-17 2011-09-22 Fisher & Company, Incorporated Recliner mechanism with mounting feature
US20130291676A1 (en) * 2012-05-07 2013-11-07 GM Global Technology Operations LLC Adjusting device, vehicle seat and motor vehicle and method for this
US20140232161A1 (en) * 2013-02-18 2014-08-21 Toyota Boshoku Kabushiki Kaisha Frame structures for vehicle seats

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CN104290632B (zh) 2017-01-04
DE102014211877A1 (de) 2014-12-24
CN104290632A (zh) 2015-01-21
JP6149537B2 (ja) 2017-06-21
US20140375106A1 (en) 2014-12-25
JP2015003631A (ja) 2015-01-08

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